is it better to fold pre-flop in an easy game w/ jacks?

[awakuni]

i was at the $40 nl game at commerce and the game was really easy as people were playing pretty badly (going broke with one pair, calling draws oop and without the right price, etc). so early in the session, after three limpers the co goes all-in for $19, i have jacks on the button. i have about $100. is this a situation that i have to call, or could i lay it down and wait b/c the players are so bad. do 2+2ers advocate giving up some pre-flop equity when the players are so weak and that there will be plenty of opportunities to make money later in the session by taking advantage of their horrible plays?